<![CDATA[This study aimed to analyze the effect of Local Microorganism (LOM) concentrations derived from stale rice waste on the growth and yield of long beans (Vigna unguiculata L.), to determine the concentration producing the best response, and to identify the nutrient content of the LOM. The research was conducted from March to May 2026 in Baruzo Village, Sogae'adu Subdistrict, Nias Regency, North Sumatra. A single-factor Randomized Block Design (RBD) was used with five concentration levels (P0 = 0 ml, P1 = 50 ml, P2 = 100 ml, P3 = 150 ml, and P4 = 200 ml LOM per 500 ml of water), three replications, 15 experimental plots, and a population of 90 plants. LOM was sprayed onto the growing medium four times at 7, 14, 21, and 28 days after planting. Growth parameters observed were plant height, stem diameter, and days to flowering, while yield parameters were pod length, number of pods, and pod weight. Data were tested for normality (Shapiro-Wilk) and homogeneity (Levene), analyzed by analysis of variance (ANOVA), and followed by Duncan's Multiple Range Test (DMRT) at the 5% level. Laboratory analysis showed that the LOM contained 0.15% nitrogen, 0.01% total P₂O₅, 0.01% K₂O, and 1.33% organic carbon. The results showed that LOM concentration had a significant effect on all observed parameters (Sig. < 0.05). Treatment P4 consistently produced the best response: plant height of 105.00 cm, stem diameter of 3.77 mm, the fastest flowering at 30.33 days after planting, pod length of 66.85 cm, 8.00 pods per plant, and pod weight of 235.22 g, whereas the control (P0) gave the lowest values. LOM made from stale rice waste is therefore promising as an inexpensive, readily available, and environmentally friendly agricultural input.]]>
